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          每天进步一点点014 - 树莓派上搭建docker/etcd
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        <h1 id="Preface"><a href="#Preface" class="headerlink" title="Preface"></a>Preface</h1><p>尝试去搭建一个最简单的分布式系统，包括消息队列，服务发现等</p>
<h1 id="Contents"><a href="#Contents" class="headerlink" title="Contents"></a>Contents</h1><h2 id="docker"><a href="#docker" class="headerlink" title="docker"></a>docker</h2><p>首先得在树莓派上安装 <em>docker</em> ，此处不赘述  </p>
<h2 id="etcd镜像"><a href="#etcd镜像" class="headerlink" title="etcd镜像"></a>etcd镜像</h2><p>由于树莓派上arm架构的，所以我们得找一个arm镜像，这里需要自己去动手，我用的是 <strong>peterrosell/etcd-rpi</strong> ，见参考列表。  </p>
<h3 id="如何知道自己的树莓派架构"><a href="#如何知道自己的树莓派架构" class="headerlink" title="如何知道自己的树莓派架构"></a>如何知道自己的树莓派架构</h3><p>查看自己的树莓派是 <em>arm32</em> 还是 <em>arm64</em> 的，可以用以下指令:</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 我的树莓派输出的是32，所以是arm32</span></span><br><span class="line">getconf LONG_BIT</span><br><span class="line"><span class="comment"># 查看cpu信息</span></span><br><span class="line">cat /proc/cpuinfo</span><br><span class="line"><span class="comment"># 查看系统信息</span></span><br><span class="line">lsb_release -a</span><br><span class="line">uname -a</span><br></pre></td></tr></table></figure>
<h2 id="使用官方的发现服务"><a href="#使用官方的发现服务" class="headerlink" title="使用官方的发现服务"></a>使用官方的发现服务</h2><p>访问<code>https://discovery.etcd.io/new?size=3</code>这个网址可以获得你的服务发现网址</p>
<h2 id="安装go"><a href="#安装go" class="headerlink" title="安装go"></a>安装go</h2><p>由于在 <strong>etcd</strong> <em>checkout</em> 完成之后提示找不到命令 <em>go</em> ,所以此处我们需要安装一下 <strong>go</strong>。<br>ps:<br>“可以在安装脚本中检测和安装对应架构的 go “</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">wget -d https://studygolang.com/dl/golang/go1.15.2.linux-armv6l.tar.gz</span><br><span class="line">tar -zxvf go1.15.2.linux-armv6l.tar.gz</span><br></pre></td></tr></table></figure>
<p>此处安装的是 <em>armv6</em> 的包， <strong>64bit</strong> 的系统另有 <em>armv8</em> 的包。<br>修改环境变量，加入 <strong>go</strong> 的 <strong>bin</strong> 目录，然后重启或者使用 <em>source</em> 重载。<br>那么我们就可以开始使用 <em>go</em> 了。</p>
<h1 id="Issues"><a href="#Issues" class="headerlink" title="Issues"></a>Issues</h1><h2 id="Bad-substitution"><a href="#Bad-substitution" class="headerlink" title="Bad substitution"></a>Bad substitution</h2><p>通过<code>sh</code>运行脚本的时候出现<code>bad substitution</code>的问题，只要在脚本文件上加上<code>#!/bin/bash</code>，然后通过 <code>bash</code>来运行脚本。</p>
<h2 id="go-mod-i-o-timeout"><a href="#go-mod-i-o-timeout" class="headerlink" title="go mod i/o timeout"></a>go mod i/o timeout</h2><blockquote>
<blockquote>
<blockquote>
<p>go: github.com/bgentry/speakeasy@v0.1.0: Get “<a target="_blank" rel="external nofollow noopener noreferrer" href="https://proxy.golang.org/github.com/bgentry/speakeasy/@v/v0.1.0.mod&quot;">https://proxy.golang.org/github.com/bgentry/speakeasy/@v/v0.1.0.mod&quot;</a>: dial tcp 172.217.24.17:443: i/o timeout</p>
</blockquote>
</blockquote>
</blockquote>
<p>设置一下goproxy的全局代理即可</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">export</span> GOPROXY=https://goproxy.io</span><br></pre></td></tr></table></figure>
<h2 id="unknown-flag-–platform"><a href="#unknown-flag-–platform" class="headerlink" title="unknown flag: –platform"></a>unknown flag: –platform</h2><blockquote>
<blockquote>
<blockquote>
<ul>
<li>docker buildx build –platform linux/arm/v7 -t peterrosell/etcd-rpi:3.4.10 .<br>unknown flag: –platform</li>
</ul>
</blockquote>
</blockquote>
</blockquote>
<p>这是因为buildx是属于实验特性，需要开启实验特性，可查看参考列表中的相关信息。<br>处理很简单，需要设置以下环境变量</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">export</span> DOCKER_CLI_EXPERIMENTAL=enabled</span><br></pre></td></tr></table></figure>
<h2 id="unsupported-platform"><a href="#unsupported-platform" class="headerlink" title="unsupported platform"></a>unsupported platform</h2><blockquote>
<blockquote>
<blockquote>
<p>etcd on unsupported platform without ETCD_UNSUPPORTED_ARCH=arm set</p>
</blockquote>
</blockquote>
</blockquote>
<p>在环境变量中添加以下内容即可</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">export</span> ETCD_UNSUPPORTED_ARCH=arm</span><br></pre></td></tr></table></figure>


<h1 id="Reference"><a href="#Reference" class="headerlink" title="Reference"></a>Reference</h1><ul>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://hub.docker.com/r/balenalib/raspberry-pi-alpine">balenalib/raspberry-pi-alpine</a>: <a target="_blank" rel="external nofollow noopener noreferrer" href="https://balena.io/">balena.io</a>IoT镜像系列的一部分</li>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://github.com/peterrosell/etcd-rpi">peterrosell/etcd-rpi</a>: 树莓派上运行etcd的参考内容</li>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://www.bookstack.cn/read/docker_practice-1.2.0/buildx-buildx.md">使用 Buildx 构建镜像</a></li>
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